If a Flying creature attacks you, you cannot block it except with another Flying creature or one with the Reach keyword
Ponder only draws you one card, but it let's you choose from among the top three--you look at the top three, pick the one you want now, put it back on top and draw it, meanwhile you put the card you want on your next turn beneath that, and the final card beneath that
Every Collector Booster contains the following: 4 Foil commons or dual lands from Ikoria 2 Foil uncommons from Ikoria 1 Foil basic land from Ikoria 1 Non-foil Commander (2020 Edition) card 1 Non-foil extended-art rare or mythic rare 1 Foil rare or mythic rare, either regular or extended-art frame 2 Non-foil common or uncommon showcase mutate cards 1 Non-foil rare or mythic rare showcase mutate card, borderless planeswalker, or borderless Triome 1 Godzilla Series Monster card (non-foil or foil) 1 Foil common, uncommon, rare, or mythic rare showcase mutate card, borderless planeswalker, or borderless Triome 1 Foil token Treatments Yourself In the best pack of an Ikoria Collector Booster, you can get up to six rares
Banned in Pioneer/Explorer and even restricted in Vintage, Karn, the Great Creator is one of the best planeswalkers you can play for four mana
It is why I run two Valgavoths Lair in my Brightglass deck here